| Programming with Ophis | ||
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The Ophis assembler is a collection of Python modules, controlled by a master script. On Windows, this should all have been combined into an executable file ophis.exe; on other platforms, the Ophis modules should be in the library and the ophis script should be in your path. Typing ophis with no arguments should give a summary of available command line options.
Table 2. Ophis Options
| Option | Effect |
|---|---|
-6510 | Allows the 6510 undocumented opcodes as listed in the VICE documentation. |
-65c02 | Allows opcodes and addressing modes added by the 65C02. |
-v 0 | Quiet operation. Only reports errors. |
-v 1 | Default operation. Reports files as they are loaded, and gives statistics on the final output. |
-v 2 | Verbose operation. Names each assembler pass as it runs. |
-v 3 | Debug operation: Dumps the entire IR after each pass. |
-v 4 | Full debug operation: Dumps the entire IR and symbol table after each pass. |
The only options Ophis demands are an input file and an output file. Here's a sample session, assembling the tutorial file here:
localhost$ ophis tutor1.oph tutor1.prg -v 2
Loading tutor1.oph
Running: Macro definition pass
Running: Macro expansion pass
Running: Label initialization pass
Fixpoint failed, looping back
Running: Label initialization pass
Running: Circularity check pass
Running: Expression checking pass
Running: Easy addressing modes pass
Running: Label Update Pass
Fixpoint failed, looping back
Running: Label Update Pass
Running: Instruction Collapse Pass
Running: Mode Normalization pass
Running: Label Update Pass
Running: Assembler
Assembly complete: 45 bytes output (14 code, 29 data, 2 filler)
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If your emulator can run PRG files directly, this file will now run (and print HELLO, WORLD!) as many times as you type RUN. Otherwise, use a D64 management utility to put the PRG on a D64, then load and run the file off that.
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